Update git submodules

* Update docs/submodules/armband from branch 'master'
  - u/fuel: Bump & rebase for latest version

    This is to include public gw on prx nodes

    Change-Id: I6dbab7ae8e3ddb1df46f908acf53eeefb5680af2
    Signed-off-by: ting wu <ting.wu@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index ae8e3fb..64e68af 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit ae8e3fba7977e109fc2ef77cf2f9e9e22be767f7
+Subproject commit 64e68af605752a539c62c0b02a613b6213b59665